libavformat/asf.c

   1 /*
   2  * ASF compatible demuxer
   3  * Copyright (c) 2000, 2001 Fabrice Bellard.
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21 #include "avformat.h"
  22 #include "riff.h"
  23 #include "mpegaudio.h"
  24 #include "asf.h"
  25 #include "common.h"
  26
  27 #undef NDEBUG
  28 #include <assert.h>
  29
  30 #define FRAME_HEADER_SIZE 17
  31 // Fix Me! FRAME_HEADER_SIZE may be different.
  32
  33 static const GUID index_guid = {
  34     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
  35 };
  36
  37 /**********************************/
  38 /* decoding */
  39
  40 //#define DEBUG
  41
  42 #ifdef DEBUG
  43 #define PRINT_IF_GUID(g,cmp) \
  44 if (!memcmp(g, &cmp, sizeof(GUID))) \
  45     printf("(GUID: %s) ", #cmp)
  46
  47 static void print_guid(const GUID *g)
  48 {
  49     int i;
  50     PRINT_IF_GUID(g, asf_header);
  51     else PRINT_IF_GUID(g, file_header);
  52     else PRINT_IF_GUID(g, stream_header);
  53     else PRINT_IF_GUID(g, audio_stream);
  54     else PRINT_IF_GUID(g, audio_conceal_none);
  55     else PRINT_IF_GUID(g, video_stream);
  56     else PRINT_IF_GUID(g, video_conceal_none);
  57     else PRINT_IF_GUID(g, command_stream);
  58     else PRINT_IF_GUID(g, comment_header);
  59     else PRINT_IF_GUID(g, codec_comment_header);
  60     else PRINT_IF_GUID(g, codec_comment1_header);
  61     else PRINT_IF_GUID(g, data_header);
  62     else PRINT_IF_GUID(g, index_guid);
  63     else PRINT_IF_GUID(g, head1_guid);
  64     else PRINT_IF_GUID(g, head2_guid);
  65     else PRINT_IF_GUID(g, my_guid);
  66     else PRINT_IF_GUID(g, ext_stream_header);
  67     else PRINT_IF_GUID(g, extended_content_header);
  68     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
  69     else PRINT_IF_GUID(g, ext_stream_audio_stream);
  70     else
  71         printf("(GUID: unknown) ");
  72     for(i=0;i<16;i++)
  73         printf(" 0x%02x,", (*g)[i]);
  74     printf("}\n");
  75 }
  76 #undef PRINT_IF_GUID
  77 #endif
  78
  79 static void get_guid(ByteIOContext *s, GUID *g)
  80 {
  81     assert(sizeof(*g) == 16);
  82     get_buffer(s, g, sizeof(*g));
  83 }
  84
  85 #if 0
  86 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
  87 {
  88     int len, c;
  89     char *q;
  90
  91     len = get_le16(pb);
  92     q = buf;
  93     while (len > 0) {
  94         c = get_le16(pb);
  95         if ((q - buf) < buf_size - 1)
  96             *q++ = c;
  97         len--;
  98     }
  99     *q = '\0';
 100 }
 101 #endif
 102
 103 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
 104 {
 105     char* q = buf;
 106     len /= 2;
 107     while (len--) {
 108         uint8_t tmp;
 109         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
 110     }
 111     *q = '\0';
 112 }
 113
 114 static int asf_probe(AVProbeData *pd)
 115 {
 116     /* check file header */
 117     if (pd->buf_size <= 32)
 118         return 0;
 119
 120     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
 121         return AVPROBE_SCORE_MAX;
 122     else
 123         return 0;
 124 }
 125
 126 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 127 {
 128     ASFContext *asf = s->priv_data;
 129     GUID g;
 130     ByteIOContext *pb = &s->pb;
 131     AVStream *st;
 132     ASFStream *asf_st;
 133     int size, i;
 134     int64_t gsize;
 135
 136     get_guid(pb, &g);
 137     if (memcmp(&g, &asf_header, sizeof(GUID)))
 138         goto fail;
 139     get_le64(pb);
 140     get_le32(pb);
 141     get_byte(pb);
 142     get_byte(pb);
 143     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
 144     for(;;) {
 145         get_guid(pb, &g);
 146         gsize = get_le64(pb);
 147 #ifdef DEBUG
 148         printf("%08"PRIx64": ", url_ftell(pb) - 24);
 149         print_guid(&g);
 150         printf("  size=0x%"PRIx64"\n", gsize);
 151 #endif
 152         if (gsize < 24)
 153             goto fail;
 154         if (!memcmp(&g, &file_header, sizeof(GUID))) {
 155             get_guid(pb, &asf->hdr.guid);
 156             asf->hdr.file_size          = get_le64(pb);
 157             asf->hdr.create_time        = get_le64(pb);
 158             asf->nb_packets             = get_le64(pb);
 159             asf->hdr.send_time          = get_le64(pb);
 160             asf->hdr.play_time          = get_le64(pb);
 161             asf->hdr.preroll            = get_le32(pb);
 162             asf->hdr.ignore             = get_le32(pb);
 163             asf->hdr.flags              = get_le32(pb);
 164             asf->hdr.min_pktsize        = get_le32(pb);
 165             asf->hdr.max_pktsize        = get_le32(pb);
 166             asf->hdr.max_bitrate        = get_le32(pb);
 167             asf->packet_size = asf->hdr.max_pktsize;
 168         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
 169             int type, type_specific_size, sizeX;
 170             uint64_t total_size;
 171             unsigned int tag1;
 172             int64_t pos1, pos2;
 173             int test_for_ext_stream_audio;
 174
 175             pos1 = url_ftell(pb);
 176
 177             st = av_new_stream(s, 0);
 178             if (!st)
 179                 goto fail;
 180             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
 181             asf_st = av_mallocz(sizeof(ASFStream));
 182             if (!asf_st)
 183                 goto fail;
 184             st->priv_data = asf_st;
 185             st->start_time = asf->hdr.preroll;
 186             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
 187                 st->duration = asf->hdr.send_time /
 188                     (10000000 / 1000) - st->start_time;
 189             }
 190             get_guid(pb, &g);
 191
 192             test_for_ext_stream_audio = 0;
 193             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
 194                 type = CODEC_TYPE_AUDIO;
 195             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
 196                 type = CODEC_TYPE_VIDEO;
 197             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
 198                 type = CODEC_TYPE_UNKNOWN;
 199             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
 200                 test_for_ext_stream_audio = 1;
 201                 type = CODEC_TYPE_UNKNOWN;
 202             } else {
 203                 goto fail;
 204             }
 205             get_guid(pb, &g);
 206             total_size = get_le64(pb);
 207             type_specific_size = get_le32(pb);
 208             get_le32(pb);
 209             st->id = get_le16(pb) & 0x7f; /* stream id */
 210             // mapping of asf ID to AV stream ID;
 211             asf->asfid2avid[st->id] = s->nb_streams - 1;
 212
 213             get_le32(pb);
 214
 215             if (test_for_ext_stream_audio) {
 216                 get_guid(pb, &g);
 217                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
 218                     type = CODEC_TYPE_AUDIO;
 219                     get_guid(pb, &g);
 220                     get_le32(pb);
 221                     get_le32(pb);
 222                     get_le32(pb);
 223                     get_guid(pb, &g);
 224                     get_le32(pb);
 225                 }
 226             }
 227
 228             st->codec->codec_type = type;
 229             if (type == CODEC_TYPE_AUDIO) {
 230                 get_wav_header(pb, st->codec, type_specific_size);
 231                 st->need_parsing = 1;
 232                 /* We have to init the frame size at some point .... */
 233                 pos2 = url_ftell(pb);
 234                 if (gsize > (pos2 + 8 - pos1 + 24)) {
 235                     asf_st->ds_span = get_byte(pb);
 236                     asf_st->ds_packet_size = get_le16(pb);
 237                     asf_st->ds_chunk_size = get_le16(pb);
 238                     get_le16(pb); //ds_data_size
 239                     get_byte(pb); //ds_silence_data
 240                 }
 241                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
 242                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
 243                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
 244                 if (asf_st->ds_span > 1) {
 245                     if (!asf_st->ds_chunk_size
 246                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
 247                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
 248                         asf_st->ds_span = 0; // disable descrambling
 249                 }
 250                 switch (st->codec->codec_id) {
 251                 case CODEC_ID_MP3:
 252                     st->codec->frame_size = MPA_FRAME_SIZE;
 253                     break;
 254                 case CODEC_ID_PCM_S16LE:
 255                 case CODEC_ID_PCM_S16BE:
 256                 case CODEC_ID_PCM_U16LE:
 257                 case CODEC_ID_PCM_U16BE:
 258                 case CODEC_ID_PCM_S8:
 259                 case CODEC_ID_PCM_U8:
 260                 case CODEC_ID_PCM_ALAW:
 261                 case CODEC_ID_PCM_MULAW:
 262                     st->codec->frame_size = 1;
 263                     break;
 264                 default:
 265                     /* This is probably wrong, but it prevents a crash later */
 266                     st->codec->frame_size = 1;
 267                     break;
 268                 }
 269             } else if (type == CODEC_TYPE_VIDEO) {
 270                 get_le32(pb);
 271                 get_le32(pb);
 272                 get_byte(pb);
 273                 size = get_le16(pb); /* size */
 274                 sizeX= get_le32(pb); /* size */
 275                 st->codec->width = get_le32(pb);
 276                 st->codec->height = get_le32(pb);
 277                 /* not available for asf */
 278                 get_le16(pb); /* panes */
 279                 st->codec->bits_per_sample = get_le16(pb); /* depth */
 280                 tag1 = get_le32(pb);
 281                 url_fskip(pb, 20);
 282 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
 283                 size= sizeX;
 284                 if (size > 40) {
 285                     st->codec->extradata_size = size - 40;
 286                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 287                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 288                 }
 289
 290         /* Extract palette from extradata if bpp <= 8 */
 291         /* This code assumes that extradata contains only palette */
 292         /* This is true for all paletted codecs implemented in ffmpeg */
 293         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
 294             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
 295 #ifdef WORDS_BIGENDIAN
 296             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
 297                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
 298 #else
 299             memcpy(st->codec->palctrl->palette, st->codec->extradata,
 300                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
 301 #endif
 302             st->codec->palctrl->palette_changed = 1;
 303         }
 304
 305                 st->codec->codec_tag = tag1;
 306                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
 307                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
 308                     st->need_parsing = 1;
 309             }
 310             pos2 = url_ftell(pb);
 311             url_fskip(pb, gsize - (pos2 - pos1 + 24));
 312         } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
 313             asf->data_object_offset = url_ftell(pb);
 314             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
 315             if (!(asf->hdr.flags & 0x01) && gsize != (uint64_t)-1 && gsize >= 24) {
 316                 asf->data_object_size = gsize - 24;
 317             } else {
 318                 asf->data_object_size = (uint64_t)-1;
 319             }
 320             break;
 321         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
 322             int len1, len2, len3, len4, len5;
 323
 324             len1 = get_le16(pb);
 325             len2 = get_le16(pb);
 326             len3 = get_le16(pb);
 327             len4 = get_le16(pb);
 328             len5 = get_le16(pb);
 329             get_str16_nolen(pb, len1, s->title, sizeof(s->title));
 330             get_str16_nolen(pb, len2, s->author, sizeof(s->author));
 331             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
 332             get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
 333             url_fskip(pb, len5);
 334        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
 335                 int desc_count, i;
 336
 337                 desc_count = get_le16(pb);
 338                 for(i=0;i<desc_count;i++)
 339                 {
 340                         int name_len,value_type,value_len;
 341                         uint64_t value_num = 0;
 342                         char name[1024];
 343
 344                         name_len = get_le16(pb);
 345                         get_str16_nolen(pb, name_len, name, sizeof(name));
 346                         value_type = get_le16(pb);
 347                         value_len = get_le16(pb);
 348                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
 349                         {
 350                                 if (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
 351                                 if (!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
 352                         }
 353                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
 354                         {
 355                                 if (value_type==2) value_num = get_le32(pb);
 356                                 if (value_type==3) value_num = get_le32(pb);
 357                                 if (value_type==4) value_num = get_le64(pb);
 358                                 if (value_type==5) value_num = get_le16(pb);
 359                                 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
 360                                 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
 361                         }
 362                 }
 363         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
 364             int ext_len, payload_ext_ct, stream_ct;
 365             uint32_t ext_d;
 366             int64_t pos_ex_st;
 367             pos_ex_st = url_ftell(pb);
 368
 369             get_le64(pb);
 370             get_le64(pb);
 371             get_le32(pb);
 372             get_le32(pb);
 373             get_le32(pb);
 374             get_le32(pb);
 375             get_le32(pb);
 376             get_le32(pb);
 377             get_le32(pb);
 378             get_le32(pb);
 379             get_le16(pb);
 380             get_le16(pb);
 381             get_le64(pb);
 382             stream_ct = get_le16(pb);
 383             payload_ext_ct = get_le16(pb);
 384
 385             for (i=0; i<stream_ct; i++){
 386                 get_le16(pb);
 387                 ext_len = get_le16(pb);
 388                 url_fseek(pb, ext_len, SEEK_CUR);
 389             }
 390
 391             for (i=0; i<payload_ext_ct; i++){
 392                 get_guid(pb, &g);
 393                 ext_d=get_le16(pb);
 394                 ext_len=get_le32(pb);
 395                 url_fseek(pb, ext_len, SEEK_CUR);
 396             }
 397
 398             // there could be a optional stream properties object to follow
 399             // if so the next iteration will pick it up
 400         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
 401             int v1, v2;
 402             get_guid(pb, &g);
 403             v1 = get_le32(pb);
 404             v2 = get_le16(pb);
 405 #if 0
 406         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
 407             int len, v1, n, num;
 408             char str[256], *q;
 409             char tag[16];
 410
 411             get_guid(pb, &g);
 412             print_guid(&g);
 413
 414             n = get_le32(pb);
 415             for(i=0;i<n;i++) {
 416                 num = get_le16(pb); /* stream number */
 417                 get_str16(pb, str, sizeof(str));
 418                 get_str16(pb, str, sizeof(str));
 419                 len = get_le16(pb);
 420                 q = tag;
 421                 while (len > 0) {
 422                     v1 = get_byte(pb);
 423                     if ((q - tag) < sizeof(tag) - 1)
 424                         *q++ = v1;
 425                     len--;
 426                 }
 427                 *q = '\0';
 428             }
 429 #endif
 430         } else if (url_feof(pb)) {
 431             goto fail;
 432         } else {
 433             url_fseek(pb, gsize - 24, SEEK_CUR);
 434         }
 435     }
 436     get_guid(pb, &g);
 437     get_le64(pb);
 438     get_byte(pb);
 439     get_byte(pb);
 440     if (url_feof(pb))
 441         goto fail;
 442     asf->data_offset = url_ftell(pb);
 443     asf->packet_size_left = 0;
 444
 445     return 0;
 446
 447  fail:
 448      for(i=0;i<s->nb_streams;i++) {
 449         AVStream *st = s->streams[i];
 450         if (st) {
 451             av_free(st->priv_data);
 452             av_free(st->codec->extradata);
 453         }
 454         av_free(st);
 455     }
 456     return -1;
 457 }
 458
 459 #define DO_2BITS(bits, var, defval) \
 460     switch (bits & 3) \
 461     { \
 462     case 3: var = get_le32(pb); rsize += 4; break; \
 463     case 2: var = get_le16(pb); rsize += 2; break; \
 464     case 1: var = get_byte(pb); rsize++; break; \
 465     default: var = defval; break; \
 466     }
 467
 468 static int asf_get_packet(AVFormatContext *s)
 469 {
 470     ASFContext *asf = s->priv_data;
 471     ByteIOContext *pb = &s->pb;
 472     uint32_t packet_length, padsize;
 473     int rsize = 9;
 474     int c;
 475
 476     assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
 477
 478     c = get_byte(pb);
 479     if (c != 0x82) {
 480         if (!url_feof(pb))
 481             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 482     }
 483     if ((c & 0x0f) == 2) { // always true for now
 484         if (get_le16(pb) != 0) {
 485             if (!url_feof(pb))
 486                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
 487             return AVERROR_IO;
 488         }
 489         rsize+=2;
 490 /*    }else{
 491         if (!url_feof(pb))
 492             printf("ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
 493         return AVERROR_IO;*/
 494     }
 495
 496     asf->packet_flags = get_byte(pb);
 497     asf->packet_property = get_byte(pb);
 498
 499     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
 500     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
 501     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
 502
 503     //the following checks prevent overflows and infinite loops
 504     if(packet_length >= (1U<<29)){
 505         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
 506         return 0; // FIXME this should be -1
 507     }
 508     if(padsize >= (1U<<29)){
 509         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
 510         return 0; // FIXME this should be -1
 511     }
 512
 513     asf->packet_timestamp = get_le32(pb);
 514     get_le16(pb); /* duration */
 515     // rsize has at least 11 bytes which have to be present
 516
 517     if (asf->packet_flags & 0x01) {
 518         asf->packet_segsizetype = get_byte(pb); rsize++;
 519         asf->packet_segments = asf->packet_segsizetype & 0x3f;
 520     } else {
 521         asf->packet_segments = 1;
 522         asf->packet_segsizetype = 0x80;
 523     }
 524     asf->packet_size_left = packet_length - padsize - rsize;
 525     if (packet_length < asf->hdr.min_pktsize)
 526         padsize += asf->hdr.min_pktsize - packet_length;
 527     asf->packet_padsize = padsize;
 528 #ifdef DEBUG
 529     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
 530 #endif
 531     return 0;
 532 }
 533
 534 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
 535 {
 536     ASFContext *asf = s->priv_data;
 537     ASFStream *asf_st = 0;
 538     ByteIOContext *pb = &s->pb;
 539     //static int pc = 0;
 540     for (;;) {
 541         int rsize = 0;
 542         if (asf->packet_size_left < FRAME_HEADER_SIZE
 543             || asf->packet_segments < 1) {
 544             //asf->packet_size_left <= asf->packet_padsize) {
 545             int ret = asf->packet_size_left + asf->packet_padsize;
 546             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
 547             if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
 548                 ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
 549             assert(ret>=0);
 550             /* fail safe */
 551             url_fskip(pb, ret);
 552             asf->packet_pos= url_ftell(&s->pb);
 553             if (asf->data_object_size != (uint64_t)-1 &&
 554                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
 555                 return AVERROR_IO; /* Do not exceed the size of the data object */
 556             ret = asf_get_packet(s);
 557             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
 558             if (ret < 0 || url_feof(pb))
 559                 return AVERROR_IO;
 560             asf->packet_time_start = 0;
 561             continue;
 562         }
 563         if (asf->packet_time_start == 0) {
 564             /* read frame header */
 565             int num = get_byte(pb);
 566             asf->packet_segments--;
 567             rsize++;
 568             asf->packet_key_frame = num >> 7;
 569             asf->stream_index = asf->asfid2avid[num & 0x7f];
 570             // sequence should be ignored!
 571             DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
 572             DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
 573             DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
 574 //printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
 575             if (asf->packet_replic_size >= 8) {
 576                 asf->packet_obj_size = get_le32(pb);
 577                 if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
 578                     av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
 579                     continue;
 580                 }
 581                 asf->packet_frag_timestamp = get_le32(pb); // timestamp
 582                 url_fskip(pb, asf->packet_replic_size - 8);
 583                 rsize += asf->packet_replic_size; // FIXME - check validity
 584             } else if (asf->packet_replic_size==1){
 585                 // multipacket - frag_offset is begining timestamp
 586                 asf->packet_time_start = asf->packet_frag_offset;
 587                 asf->packet_frag_offset = 0;
 588                 asf->packet_frag_timestamp = asf->packet_timestamp;
 589
 590                 asf->packet_time_delta = get_byte(pb);
 591                 rsize++;
 592             }else if(asf->packet_replic_size!=0){
 593                 av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
 594                 continue;
 595             }
 596             if (asf->packet_flags & 0x01) {
 597                 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
 598 #undef DO_2BITS
 599                 //printf("Fragsize %d\n", asf->packet_frag_size);
 600             } else {
 601                 asf->packet_frag_size = asf->packet_size_left - rsize;
 602                 //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
 603             }
 604             if (asf->packet_replic_size == 1) {
 605                 asf->packet_multi_size = asf->packet_frag_size;
 606                 if (asf->packet_multi_size > asf->packet_size_left) {
 607                     asf->packet_segments = 0;
 608                     continue;
 609                 }
 610             }
 611             asf->packet_size_left -= rsize;
 612             //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
 613
 614             if (asf->stream_index < 0
 615                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
 616                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
 617                 ) {
 618                 asf->packet_time_start = 0;
 619                 /* unhandled packet (should not happen) */
 620                 url_fskip(pb, asf->packet_frag_size);
 621                 asf->packet_size_left -= asf->packet_frag_size;
 622                 if(asf->stream_index < 0)
 623                     av_log(s, AV_LOG_ERROR, "ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);
 624                 continue;
 625             }
 626             asf->asf_st = s->streams[asf->stream_index]->priv_data;
 627         }
 628         asf_st = asf->asf_st;
 629
 630         if ((asf->packet_frag_offset != asf_st->frag_offset
 631              || (asf->packet_frag_offset
 632                  && asf->packet_seq != asf_st->seq)) // seq should be ignored
 633            ) {
 634             /* cannot continue current packet: free it */
 635             // FIXME better check if packet was already allocated
 636             av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",
 637                    asf_st->pkt.size,
 638                    asf->packet_obj_size,
 639                    asf->packet_frag_offset, asf_st->frag_offset,
 640                    asf->packet_seq, asf_st->seq, asf->packet_frag_size);
 641             if (asf_st->pkt.size)
 642                 av_free_packet(&asf_st->pkt);
 643             asf_st->frag_offset = 0;
 644             if (asf->packet_frag_offset != 0) {
 645                 url_fskip(pb, asf->packet_frag_size);
 646                 av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size);
 647                 asf->packet_size_left -= asf->packet_frag_size;
 648                 continue;
 649             }
 650         }
 651         if (asf->packet_replic_size == 1) {
 652             // frag_offset is here used as the begining timestamp
 653             asf->packet_frag_timestamp = asf->packet_time_start;
 654             asf->packet_time_start += asf->packet_time_delta;
 655             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
 656             asf->packet_size_left--;
 657             asf->packet_multi_size--;
 658             if (asf->packet_multi_size < asf->packet_obj_size)
 659             {
 660                 asf->packet_time_start = 0;
 661                 url_fskip(pb, asf->packet_multi_size);
 662                 asf->packet_size_left -= asf->packet_multi_size;
 663                 continue;
 664             }
 665             asf->packet_multi_size -= asf->packet_obj_size;
 666             //printf("COMPRESS size  %d  %d  %d   ms:%d\n", asf->packet_obj_size, asf->packet_frag_timestamp, asf->packet_size_left, asf->packet_multi_size);
 667         }
 668         if (asf_st->frag_offset == 0) {
 669             /* new packet */
 670             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
 671             asf_st->seq = asf->packet_seq;
 672             asf_st->pkt.pts = asf->packet_frag_timestamp;
 673             asf_st->pkt.stream_index = asf->stream_index;
 674             asf_st->pkt.pos =
 675             asf_st->packet_pos= asf->packet_pos;
 676 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
 677 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
 678 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
 679             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
 680                 asf->packet_key_frame = 1;
 681             if (asf->packet_key_frame)
 682                 asf_st->pkt.flags |= PKT_FLAG_KEY;
 683         }
 684
 685         /* read data */
 686         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
 687         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
 688         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
 689         asf->packet_size_left -= asf->packet_frag_size;
 690         if (asf->packet_size_left < 0)
 691             continue;
 692         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
 693                    asf->packet_frag_size);
 694         asf_st->frag_offset += asf->packet_frag_size;
 695         /* test if whole packet is read */
 696         if (asf_st->frag_offset == asf_st->pkt.size) {
 697             /* return packet */
 698             if (asf_st->ds_span > 1) {
 699               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
 700                     av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span\n");
 701               }else{
 702                 /* packet descrambling */
 703                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
 704                 if (newdata) {
 705                     int offset = 0;
 706                     while (offset < asf_st->pkt.size) {
 707                         int off = offset / asf_st->ds_chunk_size;
 708                         int row = off / asf_st->ds_span;
 709                         int col = off % asf_st->ds_span;
 710                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
 711                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
 712
 713                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
 714                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
 715                         memcpy(newdata + offset,
 716                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
 717                                asf_st->ds_chunk_size);
 718                         offset += asf_st->ds_chunk_size;
 719                     }
 720                     av_free(asf_st->pkt.data);
 721                     asf_st->pkt.data = newdata;
 722                 }
 723               }
 724             }
 725             asf_st->frag_offset = 0;
 726             *pkt= asf_st->pkt;
 727             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
 728             asf_st->pkt.size = 0;
 729             asf_st->pkt.data = 0;
 730             break; // packet completed
 731         }
 732     }
 733     return 0;
 734 }
 735
 736 static int asf_read_close(AVFormatContext *s)
 737 {
 738     int i;
 739
 740     for(i=0;i<s->nb_streams;i++) {
 741         AVStream *st = s->streams[i];
 742         av_free(st->priv_data);
 743     av_free(st->codec->palctrl);
 744     }
 745     return 0;
 746 }
 747
 748 // Added to support seeking after packets have been read
 749 // If information is not reset, read_packet fails due to
 750 // leftover information from previous reads
 751 static void asf_reset_header(AVFormatContext *s)
 752 {
 753     ASFContext *asf = s->priv_data;
 754     ASFStream *asf_st;
 755     int i;
 756
 757     asf->packet_nb_frames = 0;
 758     asf->packet_size_left = 0;
 759     asf->packet_segments = 0;
 760     asf->packet_flags = 0;
 761     asf->packet_property = 0;
 762     asf->packet_timestamp = 0;
 763     asf->packet_segsizetype = 0;
 764     asf->packet_segments = 0;
 765     asf->packet_seq = 0;
 766     asf->packet_replic_size = 0;
 767     asf->packet_key_frame = 0;
 768     asf->packet_padsize = 0;
 769     asf->packet_frag_offset = 0;
 770     asf->packet_frag_size = 0;
 771     asf->packet_frag_timestamp = 0;
 772     asf->packet_multi_size = 0;
 773     asf->packet_obj_size = 0;
 774     asf->packet_time_delta = 0;
 775     asf->packet_time_start = 0;
 776
 777     for(i=0; i<s->nb_streams; i++){
 778         asf_st= s->streams[i]->priv_data;
 779         av_free_packet(&asf_st->pkt);
 780         asf_st->frag_offset=0;
 781         asf_st->seq=0;
 782     }
 783     asf->asf_st= NULL;
 784 }
 785
 786 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
 787 {
 788     ASFContext *asf = s->priv_data;
 789     AVPacket pkt1, *pkt = &pkt1;
 790     ASFStream *asf_st;
 791     int64_t pts;
 792     int64_t pos= *ppos;
 793     int i;
 794     int64_t start_pos[s->nb_streams];
 795
 796     for(i=0; i<s->nb_streams; i++){
 797         start_pos[i]= pos;
 798     }
 799
 800     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
 801     *ppos= pos;
 802     url_fseek(&s->pb, pos, SEEK_SET);
 803
 804 //printf("asf_read_pts\n");
 805     asf_reset_header(s);
 806     for(;;){
 807         if (av_read_frame(s, pkt) < 0){
 808             av_log(s, AV_LOG_INFO, "seek failed\n");
 809             return AV_NOPTS_VALUE;
 810         }
 811
 812         pts= pkt->pts;
 813
 814         av_free_packet(pkt);
 815         if(pkt->flags&PKT_FLAG_KEY){
 816             i= pkt->stream_index;
 817
 818             asf_st= s->streams[i]->priv_data;
 819
 820             assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
 821             pos= asf_st->packet_pos;
 822
 823             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
 824             start_pos[i]= asf_st->packet_pos + 1;
 825
 826             if(pkt->stream_index == stream_index)
 827                break;
 828         }
 829     }
 830
 831     *ppos= pos;
 832 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
 833
 834     return pts;
 835 }
 836
 837 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
 838 {
 839     GUID g;
 840     ASFContext *asf = s->priv_data;
 841     int64_t gsize, itime;
 842     int64_t pos, current_pos, index_pts;
 843     int i;
 844     int pct,ict;
 845
 846     current_pos = url_ftell(&s->pb);
 847
 848     url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
 849     get_guid(&s->pb, &g);
 850     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
 851         gsize = get_le64(&s->pb);
 852         get_guid(&s->pb, &g);
 853         itime=get_le64(&s->pb);
 854         pct=get_le32(&s->pb);
 855         ict=get_le32(&s->pb);
 856         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
 857
 858         for (i=0;i<ict;i++){
 859             int pktnum=get_le32(&s->pb);
 860             int pktct =get_le16(&s->pb);
 861             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
 862
 863             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
 864             index_pts=av_rescale(itime, i, 10000);
 865
 866             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
 867         }
 868         asf->index_read= 1;
 869     }
 870     url_fseek(&s->pb, current_pos, SEEK_SET);
 871 }
 872
 873 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
 874 {
 875     ASFContext *asf = s->priv_data;
 876     AVStream *st = s->streams[stream_index];
 877     int64_t pos;
 878     int index;
 879
 880     if (asf->packet_size <= 0)
 881         return -1;
 882
 883     if (!asf->index_read)
 884         asf_build_simple_index(s, stream_index);
 885
 886     if(!(asf->index_read && st->index_entries)){
 887         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
 888             return -1;
 889     }else{
 890         index= av_index_search_timestamp(st, pts, flags);
 891         if(index<0)
 892             return -1;
 893
 894         /* find the position */
 895         pos = st->index_entries[index].pos;
 896         pts = st->index_entries[index].timestamp;
 897
 898     // various attempts to find key frame have failed so far
 899     //    asf_reset_header(s);
 900     //    url_fseek(&s->pb, pos, SEEK_SET);
 901     //    key_pos = pos;
 902     //     for(i=0;i<16;i++){
 903     //         pos = url_ftell(&s->pb);
 904     //         if (av_read_frame(s, &pkt) < 0){
 905     //             av_log(s, AV_LOG_INFO, "seek failed\n");
 906     //             return -1;
 907     //         }
 908     //         asf_st = s->streams[stream_index]->priv_data;
 909     //         pos += st->parser->frame_offset;
 910     //
 911     //         if (pkt.size > b) {
 912     //             b = pkt.size;
 913     //             key_pos = pos;
 914     //         }
 915     //
 916     //         av_free_packet(&pkt);
 917     //     }
 918
 919         /* do the seek */
 920         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
 921         url_fseek(&s->pb, pos, SEEK_SET);
 922     }
 923     asf_reset_header(s);
 924     return 0;
 925 }
 926
 927 AVInputFormat asf_demuxer = {
 928     "asf",
 929     "asf format",
 930     sizeof(ASFContext),
 931     asf_probe,
 932     asf_read_header,
 933     asf_read_packet,
 934     asf_read_close,
 935     asf_read_seek,
 936     asf_read_pts,
 937 };